in a dark room keep a coloured plastic bottle in a front of torch what do you observe in the shadow
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Explanation:
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We see so many objects around us, colourful and different. On the way to school we see things like buses, cars, cycles, trees, animals and sometimes flowers. How do you think, we see all these objects?
Think of the same places at night time if it were completely dark. What will you see? Suppose you go inside a completely dark room. Are you able to see any objects in the room?
But, when you light a candle or a torch you can see the objects present in the room, isn’t it? Without light, things cannot be seen. Light helps us see objects.
The torch bulb is an object that gives out light of its own. The Sun, is another familiar object that gives its own light. During the day, its light allows us to see objects. Objects like the sun that give out or emit light of their own are called luminous objects.
What about objects like a chair, a painting or a shoe? We see these when light from a luminous object (like the Sun, a torch or an electric light) falls on these and then travels towards our eye.
11.1 TRANSPARENT, OPAQUE AND TRANSLUCENT OBJECTS
Recall our grouping objects as opaque, transparent or translucent, in Chapter 4. If we cannot see through an object at all, it is an opaque object. If you are able to see clearly through an object, it is allowing light to pass through it and is transparent. There are some objects through which we can see, but not very clearly. Such objects are known as translucent.
Now, one by one hold each of the opaque objects in the sunlight, slightly above the ground. What do you see on the ground? You know that the dark patch formed by each on the ground is due to its shadow. Sometimes you can identify the object by looking at its shadow (Fig. 2).
Spread a sheet of paper on the ground. Hold a familiar opaque object at some height, so that its shadow is formed on the sheet of paper on the ground. Ask one of your friends to draw
Fig. 2 Sometimes shadow of an object gives an idea about its shape
the outline of the shadow while you are holding the object. Draw outlines of the shadows of other objects in a similar way.
Now, ask some other friends to identify the objects from these outlines of shadows. How many objects are they able to identify correctly?
Do you observe your shadow in a dark room or at night when there is no light? Do you observe a shadow when there is just a source of light and nothing else, in a room? It seems we need a source of light and an opaque object, to see a shadow. Is there anything else required?